The common cold virus is primarily caused by a group of viruses known as rhinoviruses. These viruses infect the upper respiratory tract, leading to symptoms such as a runny nose, sore throat, and cough. Colds are highly contagious and can spread through respiratory droplets when an infected person coughs or sneezes. Most people recover from a common cold within a week or two without needing medical treatment. While there is no cure, over-the-counter medications can help alleviate symptoms. Good hygiene practices, such as frequent handwashing, can reduce the risk of catching or spreading the virus.